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目的复殖吸虫是一种广泛分布的寄生性扁形动物,它们专一性地利用贝类作为第一中间宿主。自然环境中常见到一种贝类是数种吸虫的中间宿主,但该贝类的每一个体通常只存在一种吸虫幼虫期,即两种吸虫幼虫在一个螺体内具有竞争对抗现象。方法此次研究使用0.11m2框架取样器在2012年春季和秋季分别对鄱阳湖区4个不同地点的湖北钉螺种群密度、日本血吸虫和外睾吸虫的流行情况进行了调查。另外,作者还对采集到的这两种吸虫尾蚴逸出的节律性进行了研究。结果上述4个地点春、秋两季所采集到的湖北钉螺样品中,外睾吸虫的感染率(2.01%)要比日本血吸虫的感染率(0.15%)高。在春季,成活钉螺的平均密度为12.2个/0.11m2,感染率为0.3个/0.11m2;而在秋季,成活钉螺的平均密度为6.7个/0.11m2,感染率为0.2个/0.11m2。日本血吸虫尾蚴逸出的模式具有节律性,在12:00-14:00之间出现一个峰值;而外睾吸虫尾蚴逸出则呈现两个峰值:早期的峰值出现在6:00-8:00之间,晚期的峰值出现在16:00-18:00之间。结论此次实验在不同地点和不同季节所采集的湖北钉螺中,外睾吸虫相对于日本血吸虫具有较高的感染率,这对于更进一步研究湖北钉螺种群中吸虫感染的相互关系具有很重要的意义。特别是对于外睾吸虫的研究,由于其在血吸虫病的生物控制中具有很重要的作用。
Purposes The purpose of the Paragonimus is a widely distributed parasitic flat animals, which specifically use shellfish as the first intermediate host. It is common in nature to shellfish as the intermediate host for several species of trematodes, but usually there is only one trematode larvae per body in the shellfish, ie, the larvae of two species compete in a snail. Methods The 0.11m2 frame sampler was used to investigate the prevalence of snail population and the prevalence of Schistosoma japonicum and genital Clonorchis sinensis in four different locations in Poyang Lake in spring and autumn of 2012. In addition, the authors also studied the rhythmicity of the two collected cercariae. Results The infection rate of S. japonicum (2.01%) was higher than that of S. japonicum (0.15%) in the snails collected from the two locations in spring and autumn in the above four places. In spring, the average density of surviving snails was 12.2 /0.11m2, and the infection rate was 0.3 /0.11m2. In autumn, the average density of surviving snails was 6.7 /0.11m2 and the infection rate was 0.2 /0.11m2. The pattern of escape of cercariae of Schistosoma japonicum was rhythmic, with a peak between 12: 00-14: 00; while the epistatic cercariae released two peaks: the early peak appeared at 6: 00-8: 00 Between the late peak appeared between 16: 00-18: 00. Conclusion In this experiment, snails collected from different sites and seasons in Hubei snail, the relative infection rate of Schistosoma japonicum relative to Schistosoma japonicum, which is of great significance for the further study of the relationship between snail infection in snail populations in Hubei . Especially for the study of the genus Schistosoma, because of its biological control of schistosomiasis has a very important role.